Pulmonary edema is an accumulation of fluid within the parenchyma and air spaces of the lungs. Classically it is cardiogenic (left ventricular) but fluid may also accumulate due to damage to the lung.
Crystal Light sells a Metabolism-Plus product designed to increase your metabolism. The Green Tea Peach Mango flavored drink has 25 mg of caffeine per 8-oz. serving. Crystal Light also sells a variety of tea flavors. Made with tea, which contains caffeine, these products contain 10 to 15 mg of caffeine per 8-oz. serving, except for those that are labeled as caffeine free.
One cup of green tea can contain anywhere from 15 to 75 milligrams of caffeine. The best thing that you can do is to try green tea in small doses and monitor your own reactions. Start with a half of a cup per day and increase the amount gradually, observing your reaction to the increase and adjusting accordingly.